scholarly journals Orb-web spider color polymorphism through the eyes of multiple prey and predators

2017 ◽  
Author(s):  
Nathalia Ximenes ◽  
Felipe M. Gawryszewski
Keyword(s):  
Color Vision ◽  
Warning Signal ◽  
Sensory Systems ◽  
Color Polymorphism ◽  
Avian Predators ◽  
Web Spider ◽  
Color Morphs ◽  
Orb Web ◽  
Distinct Color ◽  
Orb Web Spiders

ABSTRACTThe sensory drive theory predicts that signals, sensory systems, and signaling behavior should coevolve. Variation in the sensory systems of prey and predators may explain the diversity of color signals, such as color polymorphism. The spider Gasteracantha cancriformis (Araneidae) possesses several conspicuous color morphs. The aim of the present study was to assess whether the color polymorphism of G. cancriformis may be maintained by pressure from multiple signal receivers, such as prey and predators with distinct color vision systems. Although, the multiple receivers world is a more realistic scenario, it has received little attention. In orb-web spiders, the prey attraction hypothesis states that conspicuous colors are prey lures that increase spider foraging success via flower mimicry. However, in highly defended species, conspicuous colors could also be a warning signal to predators. We used color vision modelling to estimate chromatic and achromatic contrast of G. cancriformis morphs as perceived by potential prey and predator taxa. Our results revealed that individual prey and predator taxa perceive the conspicuousness of morphs differently. For instance, the red morph is perceived as quite conspicuous to lepidopteran prey and avian predators, but not by other insects. Therefore, the multiple prey and predator hypotheses may explain the evolution of color polymorphism in G. cancriformis. However, flower mimicry hypothesis was weakly corroborated. Other parameters that are not evaluated by color vision models, such as distance, shape, angle, and pattern geometry could also affect the perception of color morphs by both prey and predators and thereby influence morph survival.

scholarly journals Prey and predators perceive orb-web spider conspicuousness differently: evaluating alternative hypotheses for color polymorphism evolution

2018 ◽  
Vol 65 (5) ◽  
pp. 559-570 ◽  
Author(s):  
Nathalia G Ximenes ◽  
Felipe M Gawryszewski
Keyword(s):  
Color Vision ◽  
Prey Species ◽  
Flower Color ◽  
Warning Signal ◽  
Theoretical Models ◽  
Color Polymorphism ◽  
Multiple Predators ◽  
Apostatic Selection ◽  
Alternative Hypotheses ◽  
Orb Web

Abstract Color polymorphisms have been traditionally attributed to apostatic selection. The perception of color depends on the visual system of the observer. Theoretical models predict that differently perceived degrees of conspicuousness by two predator and prey species may cause the evolution of polymorphisms in the presence of anti-apostatic and apostatic selection. The spider Gasteracantha cancriformis (Araneidae) possesses several conspicuous color morphs. In orb-web spiders, the prey attraction hypothesis states that conspicuous colors are prey lures that increase spider foraging success via flower mimicry. Therefore, polymorphism could be maintained if each morph attracted a different prey species (multiple prey hypothesis) and each spider mimicked a different flower color (flower mimicry hypothesis). Conspicuous colors could be a warning signal to predators because of the spider’s hard abdomen and spines. Multiple predators could perceive morphs differently and exert different degrees of selective pressures (multiple predator hypothesis). We explored these 3 hypotheses using reflectance data and color vision modeling to estimate the chromatic and achromatic contrast of G. cancriformis morphs as perceived by several potential prey and predator taxa. Our results revealed that individual taxa perceive the conspicuousness of morphs differently. Therefore, the multiple prey hypothesis and, in part, the multiple predator hypothesis may explain the evolution of color polymorphism in G. cancriformis, even in the presence of anti-apostatic selection. The flower mimicry hypothesis received support by color metrics, but not by color vision models. Other parameters not evaluated by color vision models could also affect the perception of morphs and influence morph survival and polymorphism stability.

scholarly journals Spatial learning affects thread tension control in orb-web spiders

2013 ◽  
Vol 9 (4) ◽  
pp. 20130052 ◽  
Author(s):  
Kensuke Nakata
Keyword(s):  
Spatial Learning ◽  
Tension Control ◽  
Web Spider ◽  
The Future ◽  
Thread Tension ◽  
Orb Web ◽  
Orb Web Spiders ◽  
The Way

Although it is well known that spatial learning can be important in the biology of predators that actively move around in search for food, comparatively little is known about ways in which spatial learning might function in the strategies of sit-and-wait predators. In this study, Cyclosa octotuberculata , an orb-web spider that uses its legs to contract radial threads of its web to increase thread tension, was trained to capture prey in limited web sectors. After training, spiders that had captured prey in horizontal web sectors applied more tension on radial threads connected to horizontal sectors than spiders that had captured prey in vertical sectors. This result suggests that the effect of experience on C. octotuberculata 's behaviour is not expressed in the way the trained spider responds to prey-derived stimuli and is instead expressed in behaviour by which the spider anticipates the likely direction from which prey will arrive in the future. This illustrates that learning can be important even when the predator remains in one location during foraging bouts.

Drinking behaviour of the orb web spider Argiope bruennichi (Araneae; Araneidae)

Behaviour ◽  
2011 ◽  
Vol 148 (11-13) ◽  
pp. 1295-1309 ◽  
Author(s):  
André Walter ◽  
Constanze Westphal ◽  
Peter Bliss ◽  
Robin F.A. Moritz
Keyword(s):  
Water Budget ◽  
Water Deprivation ◽  
Water Saturation ◽  
Drinking Behaviour ◽  
Water Droplets ◽  
Web Spider ◽  
Orb Web ◽  
Orb Web Spiders ◽  
Water Gain ◽  
The Web

Abstract Water is essential for survival in terrestrial animals. Balancing the water budget can be achieved by avoiding water loss and gaining water. In arthropods drinking as a process of water gain is well investigated in insects. In spiders drinking has only been shown to be present in cursorial spiders but not revealed for web builders. However, some orb web spiders were observed to occasionally ingest water droplets in the web. We here tested whether this reflects drinking. We subjected individual Argiope bruennichi spiders to two different treatments — 'water deprivation' vs. 'water saturation'. We conducted drinking tests by recording the spider's behavioural response to spraying the web with defined amounts of water. After spraying A. bruennichi searched the silk-overstitched web hub for water droplets and ingested them. Individuals that experienced the water deprivation treatment showed significantly more water ingesting behaviours, revealing that this response represents a true drinking mode. All individuals exclusively searched the covered web hubs. We further demonstrated that this structure can retain water for up to 40 min providing an effective substrate for the spiders to drink from. Hence, without the need of leaving the web the silk-covered hubs may help A. bruennichi spiders to balance their water budget.

scholarly journals The effect of predator-prey distance and prey profitability on the attack behaviour of the orb-web spider Argiope keyserlingi (Araneidae)

2001 ◽  
Vol 49 (3) ◽  
pp. 213 ◽  
Author(s):  
F. E. Champion de Crespigny ◽  
M. E. Herberstein ◽  
M. A. Elgar
Keyword(s):  
Foraging Behaviour ◽  
Physiological Condition ◽  
Web Design ◽  
Central Place ◽  
Predator Prey ◽  
Web Spider ◽  
Argiope Keyserlingi ◽  
Orb Web ◽  
Orb Web Spiders ◽  
The Web

The foraging behaviour of central-place foragers is thought to be strongly influenced by the distance between the forager and the food source (predator–prey distance). Orb-web spiders are uniquely suited for investigating this idea because they make active foraging decisions towards prey entangled in the web, and they define the dimensions of their foraging arena when they construct the web. Here we manipulate the physiological condition of Argiope keyserlingi and present the spiders with prey of varying quality, in terms of size and accessibility (location within the web and distance from the spider). We found that these spiders adjust their foraging behaviour primarily in response to their physiological condition but, in contrast to other central-place foragers, are indiscriminant of predator–prey distance or the likelihood of escape of the prey. We suggest that these factors are incorporated into the design of the web, and thus increase foraging success through efficient web design.

scholarly journals Males of the orb-web spider Argiope bruennichi sacrifice themselves to unrelated females

2010 ◽  
Vol 6 (5) ◽  
pp. 585-588 ◽  
Author(s):  
Klaas W. Welke ◽  
Jutta M. Schneider
Keyword(s):  
Paternal Care ◽  
Genetic Relatedness ◽  
Selective Pressure ◽  
Mating Behaviour ◽  
Copulation Duration ◽  
Female Fecundity ◽  
Web Spider ◽  
Orb Web ◽  
Cannibalism Rate ◽  
Orb Web Spiders

Costs of inbreeding can lead to total reproductive failure and inbreeding avoidance is, therefore, common. In classical sex roles with no paternal care, the selective pressure to avoid inbreeding is mostly on the female, which carries the higher costs. In some orb-web spiders, this situation is very different because females are polyandrous and males are monogynous or at most bigynous. Additionally, females of many entelegyne orb weavers are thought to bias paternity post-copulatorily towards a desired mate. This increases the selective pressure on males to adjust their investment in a mating with regard to the compatibility to a female. Here, we examine whether genetic relatedness influences mating behaviour in the orb-web spider Argiope bruennichi . We mated either a sibling or a non-sibling male to a female in single copulation trials and compared copulation duration, cannibalism rate and female fecundity. Our experiment revealed that males prolonged their copulation duration and were cannibalized more frequently when mating with a non-sibling female. Males mating with a sibling female were more likely to escape cannibalism by copulating briefly, thus presumably increasing their chances of re-mating with a more compatible female. This suggests that males can adaptively adjust their investment relating to the compatibility of a female.

THE STABILIMENTUM OF THE ORB WEB SPIDER, ARGIOPE ARGENTATA: AN IMPROBABLE DEFENCE AGAINST PREDATORS

1970 ◽  
Vol 102 (6) ◽  
pp. 641-655 ◽  
Author(s):  
Michael H. Robinson ◽  
Barbara Robinson
Keyword(s):  
Wild Birds ◽  
Mechanical Function ◽  
Mechanical State ◽  
Web Spider ◽  
Prey Location ◽  
Orb Web ◽  
Final Adjustment ◽  
Orb Web Spiders ◽  
The Web

AbstractThe stabilimentum of orb web spiders is a structure for which several functions, both mechanical and defensive, have been suggested. Argiope argentata (Fabricius) builds a stabilimentum in the form of a white diagonal cross. Analysis of over 2500 webs of this species shows that the perfect cross is seldom built and nearly two thirds of the webs contain no stabilimentum at all. Experiments with wild birds as predators show that they can use stabilimentum-like models in prey location. From these data, and a review of the defensive adaptations of orb web spiders, it is argued that the A. argentata stabilimentum is not an anti-predator device. The evidence for a mechanical function is reviewed and discussed. It is suggested that the stabilimentum provides the spider with a means of making a final adjustment to the mechanical state of the web when this is necessary.

scholarly journals From forest to city: urbanization modulates relative abundance of anti-predator coloration

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Nigel K Anderson ◽  
Stephanie O Gutierrez ◽  
Ximena E Bernal
Keyword(s):  
Urban Areas ◽  
Complex Nature ◽  
Urbanization Gradient ◽  
Avian Predators ◽  
Color Morphs ◽  
Coloration Pattern ◽  
Tungara Frogs ◽  
Forested Areas ◽  
Distinct Color ◽  
Predation Rates

Abstract Increased urbanization has resulted in community changes including alteration of predator communities. Little is known, however, about how such changes affect morphological anti-predator traits. Given the importance of coloration in predator avoidance, this trait in particular is expected to be susceptible to novel selective environments in urban areas. Here, we investigate the coloration pattern of a Neotropical anuran species, the túngara frog (Engystomops pustulosus), along an urbanization gradient. Túngara frogs have two distinct color patterns (unstriped and striped) which we found to occur at different frequencies along an urbanization gradient. Striped individuals increased in frequency with urbanization. To assess the strength of selection imposed by predators on the two color morphs, we deployed clay models of túngara frogs in forest and semi-urban populations. In addition, we examined microhabitat selection by individuals of the different morphs. We found higher predation rates associated with urbanization than forested areas. In particular, frogs from forested habitats had lower number of attacks by avian predators. Contrary to our predictions, however, predation rates were similar for both color morphs independent of urbanization. Also, coloration of the frogs did not affect their microhabitat preference. Overall, túngara frogs are more likely to have a striped coloration pattern in semi-urban areas where predation by birds is higher than in the forest. Our findings suggest that factors other than predation pressure shape the coloration pattern of urban frogs and emphasize the complex nature of effects that anthropogenic changes in habitat and predator communities may have on prey morphology.

scholarly journals Color Polymorphism is a Driver of Diversification in the Lizard Family Lacertidae

2020 ◽  
Author(s):  
Kinsey M. Brock ◽  
Emily Jane McTavish ◽  
Danielle L. Edwards
Keyword(s):  
Evolutionary History ◽  
Rapid Evolution ◽  
Breeding Population ◽  
Color Polymorphism ◽  
Evolutionary Transitions ◽  
Extreme Type ◽  
Color Morphs ◽  
The Family ◽  
History Of ◽  
Distinct Color

ABSTRACTColor polymorphism – two or more heritable color phenotypes maintained within a single breeding population – is an extreme type of intra-specific diversity widespread across the tree of life but rarely studied in a comparative framework. Color polymorphism is thought to be an engine for speciation, where morph loss or divergence between distinct color morphs within a species results in the rapid evolution of new lineages, and thus, color polymorphic lineages are expected to display elevated diversification rates. Lizards of the family Lacertidae have evolved multiple lineages with color polymorphism, but lack of a complete and robust phylogeny for the group has made comparative analysis difficult. Here, we produce a comprehensive species-level phylogeny of the lizard family Lacertidae to reconstruct the evolutionary history of color polymorphism and test if color polymorphism has been a driver of diversification. Accounting for phylogenetic uncertainty, we estimate an ancient macroevolutionary origin of color polymorphism within the Lacertini tribe (subfamily Lacertinae). Color polymorphism most likely evolved several times in the Lacertidae and has been lost at a much faster rate than gained. Evolutionary transitions to color polymorphism are associated with shifts in increased net diversification rate in this family of lizards. Taken together, our empirical results support long-standing theoretical expectations that color polymorphism is a driver of diversification.

scholarly journals Shaped by the Sun: the effect of exposure to sunlight on the evolution of spider bodies

2021 ◽  
Vol 17 (11) ◽  
Author(s):  
Leonardo Ferreira-Sousa ◽  
Pedro N. Rocha ◽  
Paulo C. Motta ◽  
Felipe M. Gawryszewski
Keyword(s):  
Meteorological Data ◽  
Sun Exposure ◽  
The Body ◽  
Protected Species ◽  
Body Area ◽  
Web Spider ◽  
Model Combining ◽  
Orb Web ◽  
Orb Web Spiders ◽  
Body Shapes

Body temperature can strongly influence fitness. Some Sun-exposed ectotherms thermoregulate by adjusting body posture according to the Sun's position. In these species, body elongation should reduce the risk of heat stress by allowing the exposure of a smaller body area to sunlight. Therefore, selection should favour more elongated bodies in Sun-exposed than in Sun-protected species. Diurnal orb-web spider species that sit on their webs are more likely to be Sun-exposed, on average, than nocturnal or diurnal shelter-building species. We measured the body elongation of orb-web spiders (Araneae, Araneidae) across 1024 species and classified them as Sun-protected or exposed based on the literature. We found that Sun-exposed species evolved more elongate bodies than Sun-protected ones. Further, we built a model combining traditional heat transfer models with models of thermoregulatory postures in orb-web spiders and meteorological data. The model indicates that body elongation in large orb-web spiders decreases the risk of high body temperatures. Overall, our results suggest that Sun exposure influenced the evolution of body shapes of orb-web spiders.

scholarly journals A novel property of spider silk: chemical defence against ants

2011 ◽  
Vol 279 (1734) ◽  
pp. 1824-1830 ◽  
Author(s):  
Shichang Zhang ◽  
Teck Hui Koh ◽  
Wee Khee Seah ◽  
Yee Hing Lai ◽  
Mark A. Elgar ◽  
...  
Keyword(s):  
Adaptive Response ◽  
Nutritional Value ◽  
Spider Silk ◽  
Chemical Defence ◽  
Spider Webs ◽  
Small Juvenile ◽  
Web Spider ◽  
Orb Web ◽  
Orb Web Spiders ◽  
The Web

Spider webs are made of silk, the properties of which ensure remarkable efficiency at capturing prey. However, remaining on, or near, the web exposes the resident spiders to many potential predators, such as ants. Surprisingly, ants are rarely reported foraging on the webs of orb-weaving spiders, despite the formidable capacity of ants to subdue prey and repel enemies, the diversity and abundance of orb-web spiders, and the nutritional value of the web and resident spider. We explain this paradox by reporting a novel property of the silk produced by the orb-web spider Nephila antipodiana (Walckenaer). These spiders deposit on the silk a pyrrolidine alkaloid (2-pyrrolidinone) that provides protection from ant invasion. Furthermore, the ontogenetic change in the production of 2-pyrrolidinone suggests that this compound represents an adaptive response to the threat of natural enemies, rather than a simple by-product of silk synthesis: while 2-pyrrolidinone occurs on the silk threads produced by adult and large juvenile spiders, it is absent on threads produced by small juvenile spiders, whose threads are sufficiently thin to be inaccessible to ants.

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